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Date: Fri, 24 Jan 2014 09:14:04 +0800 From: Gao feng <gaofeng@...fujitsu.com> To: netdev@...r.kernel.org, davem@...emloft.net, Sabrina Dubroca <sd@...asysnail.net>, Weilong Chen <chenweilong@...wei.com> Subject: Re: [PATCH] ipv6: reallocate addrconf router for ipv6 address when lo device up On 01/24/2014 05:03 AM, Hannes Frederic Sowa wrote: > On Thu, Jan 23, 2014 at 02:57:57PM +0800, Gao feng wrote: >> commit 25fb6ca4ed9cad72f14f61629b68dc03c0d9713f >> "net IPv6 : Fix broken IPv6 routing table after loopback down-up" >> allocates addrconf router for ipv6 address when lo device up. >> but commit a881ae1f625c599b460cc8f8a7fcb1c438f699ad >> "ipv6:don't call addrconf_dst_alloc again when enable lo" breaks >> this behavior. >> >> Since the addrconf router is moved to the garbage list when >> lo device down, we should delete this router and rellocate >> a new one for ipv6 address when lo device up. >> >> This patch solves bug 67951 on bugzilla >> https://bugzilla.kernel.org/show_bug.cgi?id=67951 >> >> CC: Sabrina Dubroca <sd@...asysnail.net> >> CC: Hannes Frederic Sowa <hannes@...essinduktion.org> >> Reported-by: Weilong Chen <chenweilong@...wei.com> >> Signed-off-by: Weilong Chen <chenweilong@...wei.com> >> Signed-off-by: Gao feng <gaofeng@...fujitsu.com> >> --- >> net/ipv6/addrconf.c | 13 +++++++++++-- >> 1 file changed, 11 insertions(+), 2 deletions(-) >> >> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c >> index 4b6b720..6eecd9d 100644 >> --- a/net/ipv6/addrconf.c >> +++ b/net/ipv6/addrconf.c >> @@ -2611,8 +2611,17 @@ static void init_loopback(struct net_device *dev) >> if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) >> continue; >> >> - if (sp_ifa->rt) >> - continue; >> + if (sp_ifa->rt) { >> + /* This dst has been added to garbage list when >> + * lo device down, delete this obsolete dst and >> + * reallocate a new router for ifa. >> + */ >> + if (sp_ifa->rt->dst.obsolete > 0) { >> + ip6_del_rt(sp_ifa->rt); > > We should not delete dst.obsolete > 0 routes. I think a ip6_put_rt is just > fine here, no? > Yes, definitely. this route has already been delete from route tree in fib6_clean_all. no need delete it again. Thanks, I will post v2 patch. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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